good
better
mad
madder
soft
softer
poor
poorer
thin
thinner
busy
busier
long
longer
sad
sadder
creepy
creepier
nasty
nastier
young
younger
friendly
friendlier
happy
happier
clumsy
clumsier
easy
easier
icy
icier
slim
slimmer
angry
angrier
healthy
healthier
silly
sillier
bad
worse
large
larger
far
further/farther